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x in (-oo:+oo)
(x-x-(1/9))^4 = 81 // - 81
(x-x-(1/9))^4-81 = 0
(x-x-1/9)^4-81 = 0
1/6561-81 = 0
1/6561+(-81*6561)/6561 = 0
1-81*6561 = 0
-531440 = 0
-531440/6561 = 0
-531440/6561 = 0 // * 6561
-531440 = 0
-531440 = 0
x belongs to the empty set
x belongs to the empty set
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